The silicon carbide relevant knowledge

Pure silicon carbide is colorless and transparent crystal. Industrial silicon carbide kind and content of the impurities contained in the type, and the pale yellow, green, blue or even black, transparency varies with its purity. Silicon carbide crystal structure is divided into hexagonal or rhombohedral and cube.
Industrial production method of silicon carbide refining quality quartz sand and petroleum coke in a resistance furnace. Refining silicon carbide blocks, crushing, acid washing, magnetic separation and screening or water-elect made ​​of various size products.
Silicon carbide, black silicon carbide, green silicon carbide two commonly used base of the species are the alpha-SiC. (1) Black silicon carbide SiC-containing about 95% of its toughness is higher than green silicon carbide, mostly for the processing of tensile strength materials, such as glass, ceramic, stone, refractory materials, cast iron and non-ferrous metals. (2) Green silicon carbide containing more than about 97% of the SiC, good self-sharpening, mostly for processing hard alloy, titanium alloy and optical glass, but also for honing cylinder liners and grinding high-speed steel cutting tools. In addition to the cubic silicon carbide, which is based on a special process to take the yellow-green crystals, abrasive suitable for bearings used in the production of super finishing, make the surface roughness Ra32 to 0.16 micron processing time Ra0.04 ~~ 0.02 microns. 
Silicon carbide, chemical stability, high thermal conductivity, thermal expansion coefficient, good wear resistance, except for abrasive, there are many other uses, example: a special process the silicon carbide powder coating on the turbine impeller or cylinder body wall, improve the wear resistance and extended service life of 1 to 2 times; which made ​​of high-grade refractory materials, thermal shock resistance, small size, lightweight, high strength, good energy saving effect. A low-grade silicon carbide (SiC-containing approximately 85%) is excellent deoxidizer, it can accelerate the the steelmaking speed, and easy to control the chemical composition, to improve the quality of the steel. In addition, silicon carbide is used extensively for the production of electric heating elements silicon carbide.